https://www.gamespot.com/articles/fortnite-challenges-for-season-6-week-1-dance-in-s/1100-6462106/

The first week of Fortnite Season 6 is here, so you have a whole new set of challenges to complete. Along the lines of how thing worked last season, three of these are available for free to all players. The other four require the purchase of this season's Battle Pass, which goes for 950 V-Bucks and allows you to unlock a wide variety of cosmetic rewards.

Despite it being a new season with several major changes, there isn't anything drastically new with what you'll have to do to complete all seven challenges. If you've been keeping up with Fortnite these past few months, then this week's challenges should all be fairly familiar. The first three free challenges will net you a total of 13 Battle Stars, and completing the four Battle Pass challenges rewards you with another 16.